As announced by Joe C on Sunday, he is "away" following the AllStar Break. In his place were Dave O'Brien and Glenn Geffner.
[To be honest, I only heard bits and pieces, give the fact that I was on the traditional Thursday Night Bike Ride (very pleasant, by the way). I stole a listen here and there and what follows might be skewed based on small sample size]
Dave was trying really hard to bring Geffner into the flow. He cast a few "Glenn?'s" his way to try to knock him off his house of notecards. Success was perceptible, but limited. During Glenn's call (the parts that I heard) O'Brien was right up in the mike, trying to maintain momentum.
At this point, O'Brien clearly has more skin in the game than Joe Castiglione in making Geffner listenable. Good luck, bro.
The overall impression is that is the dry run for Your 2008 Boston Red Sox Baseball Radio Team. However, this is based on no fact, but just a sense.
Prove me wrong, Larry. I'm begging you.